Filament scraper



May 27, 1947. J. EHRET, JR

FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet l a ME TT; N HE E vmm Nam. w

J. EHR ET, JR

FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet 3 \vIIII #vvavroE JfI/EEZJE.

QRMwd-M ATTORNEY May 27, 1947.

J, EHRET, JR

FILAMENT SCRAPER Filed Feb. 16, 1944 5 Sheets-Sheet 4 v J fl/EEZ J2.

.nrrolelvgx J. EHRET, JR FILAMENT SCRAPER Filed Feb. 16, 1944 5Sheets-Sheet 5 Patented May 27, 1947 UNITED STATE PATENT OFFICE FILAMENTSCRAPER Application February 16, 1944, Serial No. 522,610

7 Claims.

This invention relates to material treating apparatus, and moreparticularly to apparatus for scraping given lengths of coating fromcoated filaments for use in vacuum tubes.

Vacuum tube filaments are generally cut from a strand or ribbon ofsuitable material coated, for example, with a barium-strontium mixturebaked to a hard surface. The necessary treatment to condition suchfilaments for welding, to support wires of the mounting structures ofthe Various types of vacuum tubes, includes cutting of the filamentmaterial into definite lengths and removing the coating from the ends ofeach length.

An object of the invention is to provide a material treating apparatuswhich is highly efficient in treating filaments for vacuum tubes.

With this and other objects in view, the invention comprises a materialtreating apparatus having mechanisms to advance a covered materialpredetermined distances intermittently, scrape the cover for variabledistances from opposite sides of the material at predetermined variablespaced distances, and sever the material at the scraped positions.

Other objects and advantages will be apparent from the followingdetailed description when considered in conjunction with theaccompanying drawings, wherein Fig, l is a top plan view of theapparatus;

Fig. 2 illustrates a ribbon-type filament and the effect of the scrapingunits of the apparatus thereon;

Fig. 3 illustrates a strand-type filament and the eifect of the scrapingunits thereon;

Fig. 4 is a schematic illustration of the strandtype of filamentmaterial, illustrated in Fig. 3, being scraped:

Fig. 5 is a schematic illustration of the scraping of the ribbon-type offilament, illustrated in Fig. 2;

Fig. 6 is a front elevational view of the apparatus;

Fig. 7 is an enlarged fragmentary front elevational view of a portion ofthe structure shown in Fig. 6;

Fig. 8 is a fragmentary front elevational view of the material feedingunit;

Fig. 9 is a vertical sectional view of the feeding unit, this view beingtaken along the line 9-9 of Fi 8;

Fig. 10 is a fragmentary sectional view taken along the line |0l0 ofFig. 8;

Fig. 11 is a fragmentary front elevational view of the material grippingand shearing units;

Fig. 12 is a vertical sectional view taken along the line l2l2 of Fig.11;

Fig. 13 is a fragmentary schematic sectional view taken substantiallyalong the line I3--l3 of Fig. 11;

Fig. 14 is a fragmentary front elevational view of one of the scrapingunits;

Fig. 15 is a vertical sectional view of the scraping unit shown in Fig.14, this view being taken along the line I 5-I 5 of this figure; and

Fig. 16 is a fragmentary horizontal sectional view taken substantiallyalong the line IBI6 of Fig. 14.

Referring now to the drawings, attention is first directed to Figs. 1, 6and 7. A supporting base or table I!) has a motor ll mounted thereon;this motor constituting the power means for the apparatus, and through apulley connection I2, a shaft M of a speed reducing unit 15 is driven.The shaft l4 extends through the unit and has an elliptical cam 16mounted on the forward end thereof. As hereinafter described, the cam Itwill cause vibration or lateral reciprocation of scraping elements I! ofscraping units indicated generally at IB and 19. An output shaft 20 ofthe speed reducing unit I5 is connected, through a couple 2|, to a camshaft 22. Through the aid of the cam shaft 22, the various units of theapparatus are actuated, including the material feeding unit indicatedgenerally at 2-3, the material gripping and holding unit indicatedgenerally at 24, the shearing unit indicated generally at 25, inaddition to certain portions of the scraping units I 8 and l 9.

Vertical brackets or members 28 and 23 support, in apertures thereof,parallel supporting rods 30, which provide the main support for thevarious units, the brackets in turn being mounted upon the base Ill atspaced positions as illustrated.

A drum 32 for supporting a supply of material 33 is rotatably supportedby a shaft 34, the ends of which are carried by vertical members 36extending from the base Ill upon which they are mounted. The material 33passes downwardly about a sheave 3'! and over a sheave 38, from where ittravels longitudinally of the apparatus, controlled in its advancementrelative to the scraping units 18 and I9 and the units 24 and '25 by thefeeding unit 23. The sheave 31 is supported by the end of a lever 39,pivotally supported at 43 and having an arm M for supporting a weight42, the latter being adjustable on the arm to vary the downward force ofthe lever on the sheave 3'! and thus on the material 33. A spring 43,having one end fixed as at 44 to the lever 39 and the other endconnected, through the aid of a strand 45, to a fixed member 46 as at41, serves to apply a given lifting force to the lever which iscounteracted by the weight 42, depending upon the tension desired to becreated in the material 33.

Considering now the feeding unit :23, attention as directed to Figs. 1and 6 for the general illustratiop, thereof and Figs. 7 to 10 inclusivefor more detailed illustration of the feeding unit. The unit 23 includesa support or body member 56 apertured, as at for mounting upon thesupporting rods 36 for sliding movement thereon. The supporting member56 includes an integral upper portion 52 apertured, at 53, to receive anactuating rod 54. Compression springs 55 are disposed concentric withthe actuating rod 54 between collars 56 and their respective sides ofthe projection 52, providing a cushioned connection between theactuating rod and the support. The collars '56 may be secured to theactuating rod 54 at any desired position thereon depending upon thelength of material desired for each filament. Also, collars 58 and 59(Figs. 6 and 8) are mounted upon the upper supporting rod 36 at desiredspaced positions to serve as stops for the unit 23.

Gripping elements 66 and BI are pivotally supported, at .62, upon thesupport 56 and are of the respective contours as shown, provided withconcaved recesses 63 adjacent their pivots to receive a cylindricalcontrol member 64. Through this structure the actuation of eitherelement will cause like actuation of its companion element. A spring 65normally urges the elements 66 and 6| into closed positions, adaptingthem to grip, between their jaws 66, the end of the material. A camsurface 61, disposed at an angle with respect to the longitudinal centerline of the elements, extends into a concaved retaining recess 68 toreceive an actuating finger 69, which serves to cause actuation of thegripping elements when riding upon the cam surface 61 and into therecess 68. The recess 68 serves to hold the finger 69 againstdisplacement during movement of the unit 23 toward the units 24 and '25.The finger 69 is pivotally supported, as at I6, and has lateralprojections ll and '12 positioned to be engaged by'cam actuating rods I3and 14, respectively. When in the position shown in Figs. 1, 6, 8, 9 and10, the cam actuating rod I3 is positioned for actuation through a camlever I6. The cam lever 16 is mounted for rotation upon a shaft 11, thelatter being supported in suitable bearings I8 and the vertical member29. A cam 86', fixedly mounted upon the cam shaft 22 and of the contourshown in Fig. 9, is adapted to actuate the lever I6 through theengagement of a high portion 8| of the cam with a cam roller 82 of theleveri'IG. A spring 83 causes the cam roller 82 to constantly ride uponthe cam 86 and to hold the lever. 16 in its inoperative position untilactuated by the high portion 8| of the cam. The function of thismechanism under the control of the cam 86 is to a move the rod I3upwardly to rock the finger 69 about its pivot 16 and ride upon the camsurface 61 ofthe element 66 until its engaging end is disposed in therecess 68, to thus open the elements 66 and 6| and hold them in the openposition for a given length of time.

The rods I3 and I4 are supported for vertical movement in aperturedportions 85 integral with the support 56. Pins 86, carried by each ofthe rods I3 and I4, normally rest upon their lower portions 85 to locatethe lower ends of the rods I3 and I4 short distances above the normalpositions of the engaging ends of their respective cam levers. Thedetailed structures of the cam 86 and its lever I6 for the rod I3 areshown particularly in Fig. 9. Another cam 96, identical with the cam 86,is mounted upon the cam shaft 22, as illustrated in Fig. l, and adaptedto actuate a cam lever 9i, which is substantially identical in structureto the cam lever I6, rotatably mounted upon the shaft 11 and providedwith a spring similar to the spring 63 to cause the lever 9| to benormally held in its inoperative position against its cam 96 until timefor its actuation by a high point of the cam 96 similar to the highpoint 8| of the cam 86. The levers l6 and 9|, as illustrated in Fig. 1,are disposed at spaced positions. When the unit 23 is moved to itsextreme position, to the right (Figs. 1 and 6), the gripping elements 66and 6|, which are in open position during this movement, have their jaws66 disposed above and below the forward end of the material 33 which isheld by the unit 24. After the unit 23 reaches this position, the rod I4is disposed above the lever 9! and is actuated or moved upwardly throughthe actuation of the lever 9i by its cam 96, to trip the finger 69,moving it out of its recess 68 and into the position shown in Fig. 8.The spring 65 thus causes closing of the gripping elements 66 and 6|,causing them to grip the ends of the material.

The mechanism for actuating the feeding unit 23 through the aid of theactuating rod 54 is shown at the left of both Figs. 1 and 6. The camshaft 22, which is driven by the motor I I, is journalled in suitablebearings in the vertical member '28 and in a bearing bracket which ismounted upon the table or base I6. A bevelled gear96 is mounted upon theadjacent end of the cam shaft 22 and interengagesa similar bevelled gear91, the latter being mounted upon a vertical shaft 98 which isjournalled in a bearing 99 supported by the table I6. The shaft 98 alsohas a wheel I66 mounted thereon above the gear 91, the Wheel having aneccentric spindle I6I carried therebyand projecting into a connectingblock I62. The block [62 is positioned to ride in an elongate apertureI63 of a lever I64, the latter having one end pivotally supported at I65while the other end is connected through a link I66 to the actuating rod54. Therefore, through the constant rotation of the wheel I66, the leverI64, through the eccentric connection with the wheel, is oscillatedabout its pivot I65 to cause reciprocation of the actuating rod 54 tomove the unit 23 to intermittently advance given lengths of the material33. It will be noted that the actuating rod 54 is supported in a bearingI61 carried by the vertical member 29 and in a bearing portion 168 of asupporting bracket I69, which supports the units 24 and 25.

Attention is now directed to the unit 24, which is shown in detail inFigs. 11 and 12. This unit constitutes the material h'olding means andis similar in structure to the unit 23 in that it is provided withmaterial gripping elements I I2 and I I4 pivotally supported-at H5 andhaving a connecting member-H6- cylindrical in contour and receivable inconcave recesses I H of the elements H2 and H4, to cause simultaneousand like actuation of both elements when one of the elements isactuated. The forward ends of the elements 2 and H4 are provided withgripping jaws IIB between which the material 33 is advanced, through theaid of the unit 23, when the elements are in open position, and, throughthe aid of which the material'may be held against displacement, duringthe scraping operations. The elements 2 and H4 are normally held inclosed positions through the aid of a spring I26 positioned between thelegs of the elements, as illustrated in Fig. 12. The pivots H5 arethreadedly disposed in the supporting bracket I69 so that the grippingjaws are positioned adjacent the path of advancement of the material.

An actuable plunger I2 I, supported in a sleeve I22, carried by alateral projection I23 of the supporting bracket I09, has its lower endpositioned to be engaged by a cam lever I24 which is mounted forrotation upon the shaft 11 and provided with a cam roller I25 held inengagement with the periphery of a cam I26 through the aid of a springI21. As illustrated in Fig. 12, the gripping elements H2 and H4 are intheir closed positions, and during this interval a low portion I28 ofthe cam I26 rides upon the roller I25, a high portion I29 of the camcausing actuation of the lever I24 to move the plunger I2I upwardly tocause movement of the elements H2 and H4 into open positions against theforce of the spring I20.

The unit 25, namely the shearing unit, is also mounted upon thesupporting bracket I09. This unit includes companion shearing elementsI32 and I33, which are mounted upon a common pivot I34 carried by thebracket I09. Through the aid of a spring I35 (Fig. 11) engaging theshearing element I33, a given force is applied to hold the elements inclose engagement with each other, to perform a satisfactory shearingoperation upon the material 33, the shearing element I32 being backed upby the bracket I09. The bracket I09 is, as illustrated, supported by thesupporting rods 30, locating the units 24 and 25 in their preferredpositions adjacent the path of the material 33. The elements I32 and I33have shearing edges I36 and I31, respectively, which, when movedrelative to each other into the closed position shown in Figs. 11 and13, will shear the material. Through the aid of links I39 and I40, theelements I32 and I 33 are connected operatively to their respective camlevers MI and I42. The cam levers are rotatably mounted upon the shaft11 and are provide with cam rollers I43 and I44 respectively, which areheld in engagement with their cams I45 and I46 through the aid ofsprings I41 and I48. The cams I45 and I46 are mounted upon the cam shaft22, for rotation therewith, and differ in contour to cause reversemovements of the cutting elements I32 and I33. The cam I 45 has a highportion I50 throughout its periphery excepting between positions II andI52, where a low portion I53 is provided to allow the spring I41 tocause movement of its element I32 into closed position as shown in Fig.13. The cam I46 has a low portion I55 for the major portion of itsperiphery excepting between positions I56 and I51, where a high portionI58 causes actuation of its lever I42 to move the element I33 intoclosed or cutting position. Therefore, for the major portion of theoperating cycle the cutting elements I32 and I33 are held in their openpositions, as illustrated in Fig. 7, so that the forward ends orgripping jaws 66 of the elements 60 and BI of the feeding unit 23 maypass therebetween to grip the leading end of the material 33 held by theelements I I2 and I I4 of the unit 24.

Attention is now directed to the scraping units I8 and I9, which areidentical in structure, a description of one being applicable to bothunits. The unit I8 has been selected and is shown in detail in Figs. 14,15 and 16. This unit includes a supporting bracket I60 mounted upon thesupporting rods 30 at a selected position with respect to the verticalmember 28 and the supporting bracket of the companion unit I9. Arectangular aperture I6I is formed in the supporting bracket I60, toreceive a reciprocable element I62 formed for reciprocation betweengiven limits in the aperture. The element I62 has spaced portions asillustrated in Fig. 6, to receive a mounting clamp I63 therebetween, thelatter being fixedly mounted upon an actuating rod I64 to thus connectthe element thereto. The actuating rod I64 has a similar connection withthe unit I9 and serves to cause simultaneous actuation of the scrapingelements I1 ofboth units. This actuation of the rod I 64 is broughtabout through the rotation of the cam I6 engaging a cam roller I66 whichis constantly urged to ride upon the cam through the aid of a springI61. The actuating rod I64 is supported for its reciprocable movement inan aperture I68 in the vertical member 28.

Returning now to the element I62, it will be noted that a forwardlyprojecting portion I10 thereof is provided with a vertical threadedaperture I1I to receive a threaded sleeve I12 held in a desired adjustedposition therein relative to the path of the material 33 through the aidof a nut I13. The scraping element I1, having a tapered lower end I15extending to an edge sumciently sharp for the removal of the coating orcovering material from the core of the main material 33, is movablydisposed in the sleeve I12 limited in its movement by a notch I16cooperating with a pin I11 carried by the sleeve I 12. A spring I18engages the scraping element I1 in the sleeve I12 to apply a desiredholding force upon the element, which force may be varied through theaid of an adjusting screw I19, the adjustment of which may be heldthrough the aid of a nut I80. Through the aid of this mechanism, thescraping element I1 is constantly reciprocated between given limitsunder the control of the cam I6 and the actuating rod I64. The path ofadvancement of the material 33 is beneath the scraping element I1, asillustrated in Fig. 15. During its advancement, the material 33 ridesupon spaced portions I82 of a table I 83, the central portion of whichis recessed, as at I84. The table I83 has tubular portions I85 integraltherewith and projecting downwardly over vertical guides I86 supportedby lateral projections I81 of the supporting bracket I 60. Integral armsI90 of the supporting bracket I60 are of the contours illustrated inFig. 15, extending rearwardly in parallel spaced positions to'supportthe ends of a shaft I9I and formed to straddle the cam shaft 22 as atI92. A cam I93, keyed to the cam shaft 22 and of the contour shown inFig. 15, is adapted to actuate a cam lever I94 supported by the shaftI9I through the aid of a cam roller I95 rotatably carried by the lever.The cam lever I94 is normally urged counterclockwise through the aid ofa spring I96. to maintain the roller I95 upon the periphery of the cam.Through the aid of a link I98, the cam lever I94 is operativelyconnected to the table I83 to cause vertical movement of the tablerelative to the scraping element I1 to move the material into engagementwith the scraping element. Means is provided to cooperate with the tableI83, particularly the supporting portions I 82 thereof, to grip thematerial upon,

the opposite sides of the scraping element I1 and to hold the materialagain-st displacement during the scraping operation. This means includes"a pad 200 supported by screws 20I movably disposed in lateralprojections 202 of the supporting bracket I60 and normally urgeddownwardly, through the aid of springs 203 interposed between the pad200 and the projections 202, as illustrated in Fig. 14, and limited inthe downward movement by the heads of the screws 2III.

As heretofore stated, the unit I 9 is identical in every detail with theunit I8 and is operated simultaneously herewith to move the adjacentportion of the material into engagement with its vibrating orreciprocating element IT for the scraping of the covering from thematerial. These units are positioned with respect to each other and theshearing element 25, depending upon the length of the filament orarticle desired to be scraped from the material. The shearing operationis performed, in the present instance, at the center line of the scrapedportion of the material. Therefore, the accurate adjustment of the unitsis important. The unit I8 and I9 are so complete in themselves that theadjustment requires only their movement on the supporting rods, theintegral arms I90 thereof causing simultaneous adjustment of the camsI93 on the cam shaft 22 through their key connections.

A platform or receivin tray 295 extends between units 23 and 25 a shortdistance therebeneath, when the former is in the left hand position asshown in Figs. 1 and 6, to receive the severed articles of filaments.The tray is provided with supporting legs 206 through the aid of whichtray may be supported and mounted upon the table I0,

Considering now the operation of the apparatus, let it be assumed thatthe various units are in their desired positions and that the material33 is of the ribbon type illustrated in Figs. 2 and 5. Let it also beassumed that the material. is threaded through the apparatus asillustrated in Figs. 1, 5 and 6. During the threading of the material,it is given a twist so that one half turn will exist in the materialbetween the scraping units I8 and I9 as illustrated in Fig. 5. Duringthe operation of the unit I8, the portion of the material adjacent therecess I84 of the table I83 will be moved into engagement with thescraping element I! of this unit, resulting in the scraping of the coverfrom the adjacent side of the material. The material is held firmlyagainst displacement between the portions I82 of the table and the pad200 through the force of the springs 203, leaving the portion of thematerial being scraped unsupported.

The function of the unit I9 will not be discussed at this time. Instead,attention is directed to the advancement of the material as the unit I9and I9 open, moving their tables I83 downwardly to thus move thematerial away from the scraping element II, the unit 23 firstapproaching the leading end of the material disposed adjacent the unit25, the material adjacent this portion being held by the unit'24. Assoon as the unit 23 reaches its extreme-position at the right, thefinger 69 will be .tripped, that is, moved free of its retaining recess68, allowing the spring 65 to close the elements 60 and 6| to grip theleading end of the material. As soon as this has been accomplished, thegripping elements II2 and I I4 of th unit 24 are opened through theactuation of the cam I25, freeing the material for advancing a givendistance. This advancement is brought about through the movement of theunit 23 to its extreme position at the left, through the actuation ofthe rod 54 and the eccentric driving means therefor illustrated in Figs.1 and 6. During this advancement of the material, the portion thereofwhich was scraped by the'element I! of the unit I 8 is presented to theunit I9, the scraped portion, however, being disposed at the opposite orunder side of the material away from the scraping element II of the unitI9. Therefore, during the next scraping operation when both units I8 andI9 function, the unit I8 will scrape anew portion of the material, whilethe unit I9, that is, its element II, will scrape the opposite side ofthe portion previously scraped by the unit I8.

During the next advancing cycle of the material, which is brought aboutwhile the shearing unit 25 is open, the portion present at the unit I 9will be disposed at the shearing unit 25. Thus after the unit 23 hascompleted the advancement of the material and the holding members of theunit 24 have closed upon the material, the shearing elements I32 and I33will be moved into closed positions simultaneously through the actuationof their respective levers functioning through their cams to shear thematerial at the center line of the scraped portion. The sheared portionof the material will drop upon the tray or table 205, where it may beremoved at will, it being released by the opening of the unit23.

As previously stated, the materials from which the filaments may beformed, throughthe aid of this apparatus, may Vary in size from that ofthe strand type illustrated in Figs. 3 and:4 to those having greaterwidths such as the ribbon type illustrated in Figs. 2 and 5. When theapparatus is employed to scrape material of the strand type, it is notnecessary to thread this type of material through the apparatus with anexisting twist present therein between the units I8 and I9. Bysupporting the material only at the opposite sides of the portion beingscraped and leaving that portion unsupported, the action of the scrapingelement II will actually scrape the covering from one side of thematerial and break the covering free of the other parts of that scrapedportion due to the reciproeabl action of the resiliently supportedelement I'I' of each unit and the bending or flexing action of thatportion of the material. In this instance the same operation is repeatedat the unit I9 that was performed at the unit I8, to assurecompleteremoval of all portions of the covering at the desired length ofmaterial being scraped;

In reviewing the function ofthe-apparatus, it will be observed thatunits I8, I9, 25 and 23 are open and the unit 24 is closed when the unit23 is ready to grip the leading end of the material. The unit 25 remainsclosed until after the unit 23 is closed, to grip the end of thematerial, after which the unit 24 is open, allowing advancement of thematerial the given distance equalling the distance between the scrapingelement F! of the units I8 and I9. After the material has been advancedand before the unit 23 returns to advance the material another givenlength, the first length of the material is severed by the closing ofthe unit 25, during which time units I8 and I9 are closed to bring aboutthe scraping operations thereof, the material being held under tensionbetween the unit 24 and the supply drum 32, this tension being createdthrough the lever 39 under the control of the weight 42 and the spring43.

Although specific improvements of the invention have been shown anddescribed, it will be understood that they are but illustrative and thatvarious modifications may be made therein without departing from thescope and spirit of this invention as defined by the appended claims.

What is claimed is:

1. An apparatus for scraping portions of a cover from a covered core,the apparatus comprising a scraping element having a, scraping edge,means to continuously reciprocate the element between given limits,means to grip a covered core at spaced positions beyond the said limitsof the element, leaving the intermediate portion thereof unsupported,and means to move the gripping means to move the unsupported portion ofthe core into engagement with the scraping edge of the element forscraping a portion of the cover from the said unsupported portion of thematerial.

2. An apparatus for scraping portions of a cover from a covered core,the apparatu comprising a scraping element having a scraping edge, meansto continuously reciprocate the element between given limits, companiongripping members formed to grip a. covered core adjacent the said limitsand leave the intermediate portion thereof unsupported, and means tocause movement of one of the gripping members toward the other grippingmember to cause them to grip the covered core and to subsequently movethe gripping members with the covered core to move the unsupportedportion thereof laterally into engagement with the scraping edge of theelement.

3. An apparatus for scraping portions of a cover from a coveredfiat-sided core, the apparatus comprising a scraping element having ascraping edge, means to continuously reciprocate the element betweengiven limits, companion gripping members formed to grip a covered coreadjacent the said limits and leave the intermediate portion thereofunsupported, and means to cause movement of one of the gripping memberstoward the other gripping member to cause them to grip the covered coreand to subsequently move the gripping members with the covered core tomove the unsupported portion thereof sidewise laterally into engagementwith the scraping edge of the element to cause removal of all parts ofthe cover of the portion within the said limits of the element.

4. An apparatus for scraping portions of a cover from a covered core,the apparatus comprising means to advance a covered core intermittentlyin a given path, like scraping elements disposed at spaced positions onthe same side of the said path, and means to cause presentation ofopposing sides of the covered core to the respective scraping elementsto cause removal of portions of the cover from opposite sides of thecore.

5. An apparatus for scraping portions of a cover from a covered core,the apparatus comprising a feeding unit movable between a grippingposition and a releasing position including companion gripping elementsone of which has a cam surface, separate means to pivotally support theelements, means operatively connecting the elements for movement of oneof the elements into open or closed positions upon movement of the otherelement into its open or closed positions, means to normally urge theelements into their closed positions, a finger pivotally supported bythe unit and movable in engagement with the said cam surface to move theelement thereof into open position, cause the connecting means to movethe other element into open position and hold the elements in the openpositions during their travel to the gripping position to grip theleading end of the core, means actuable adjacent the gripping positionto release the finger to render the closing means effective to cause theelements to grip the leading end of the core, means to move the unit tointermittently advance the core, and means to scrape a portion of thecover from the core.

6. An apparatus for scraping portions of a cover from a covered core,the apparatus comprising a feeding unit movable between a grippingposition and a releasing position including companion gripping elementsone of which has a cam surface, separate means to pivotally support theelements, means operatively connecting the elements for movement of oneof the elements into open or closed positions upon movement of the otherelement into its open or closed positions, means to normally urge theelements into their closed positions, a finger pivotally supported bythe unit and movable in engagement with the said cam surface to move theelement thereof into open position, cause the connecting means to movethe other element into open position and hold the elements in the openpositions during their travel to the gripping position to grip theleading end of the core, means actuable adjacent the gripping positionto release the finger to render the closing means effective to cause theelements to grip the leading end of the core, means to move the unit tointermittently advance the core, means to scrape a portion of the coverfrom the core, and means actuable adjacent the releasing position tomove the finger to move the elements into their closed positions.

7. An apparatus for scraping portions of a cover from a covered core,the apparatus comprising a feeding unit movable between a grippingposition and a releasing position including companion gripping elementsone of which has a cam surface, separate means to pivotally support theelements, a cylindrical member disposed in recesses of the elementsbetween their pivotal supports to cause movement of one of the elementsinto open or closed position upon movement of the other element into itsopen or closed position, means to normally urge the elements into theirclosed positions, a finger pivotally supported by the unit and movablein engagement with the said cam surface to move the element thereof intoopen position, cause the connecting means to move the other element intoopen position and hold the elements in the open positions during theirtravel to the gripping position to grip the leading end of the core,means actuable adjacent the gripping position to release the finger torender the closing means efiective to cause the elements to grip theleading end of the core, means to move the unit to intermittentlyadvance the core, and means to scrape a portion of the cover from thecore.

JOHN EHRET, JR.

REFERENCES CITED The following references are of record in the file ofthis patent:

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